Method of making drawings or pictures.



W. R. HOPE.

METHOD OF MAKING DRAWINGS 0R PICTURES. APPLICATION FILED MAR- 25. 1916.

l ,240, 1.43 v Patented Sept. 11, 1917.

7 /7/M yfl Fwy ATTORNEYS WALTER R. HOPEQOF WILMINGTON, DELAWARE.

METHOD OF MAKING DRAWINGS OR PICTURES. I

Specification of Letters Patent.

Patented Sept. 11, 1917.

Application filed March 1916. Serial No. 86,654.

To all whom it may concern:

Be it known that I, WALTER R HOPE, a citizen of the United States, residing at Wilmington, in the county of New Castle, State of Delaware, have invented a new and useful Method of Making Drawings or Pictures, of which the following is a specification.

In the methods heretofore employed in making drawings which are to be reproduced, such as for example, shop drawings, it is customary to first make a lead pencil drawing either on detail paper or on trac ing paper, after which the drawing is traced on linen with waterproof ink in order to make a permanent record. This renders it necessary to first make a drawing in pencil, then the drawing is checked, then traced, and the tracing is checked.

In accordance with my present invention, I eliminate several of these operations.

With the above in View, my invention, in its broad and generic scope, consists in delineating the subj cot-matter to be illustrated with a copying pencil upon the material, and I then treat the delineations in such a manner as to render them permanent and form a permanent record, from which prints can be made by any desired or conventional solar or other process.

It further consists of a novel method wherein the subject-matter is delineated upon a sheet of material with a copying pencil, and thereafter the delineation is subjected to vapor or to heat and vapor in order to permanentize the delineation.

In the accompanying drawing which represents a plan view of a sheet of material with the delineations thereon, I have illustrated the first step of carrying out my method.

Referring to this drawing, 1 designates a sheet of suitable material on which the delineation 2 is made.

In carrying out my invention, I take a sheet of material, the transparency of which is not affected by heat and moisture, and I preferably employ tracing paper or tracing.

linen. It will be understood that ordinary tracing paper may be employed, but that when tracing linen or tracing cloth is employed, the same must be waterproof or impervious to moisture or of material which will not dissolve with moisture and make the transparency defective. I then draw upon the sheet with a pencil, preferably employing an indelible or copying pencil. The pencil lines can be erased without smearing in case it is desired to correct them. After the drawing is corrected, I

subject it to a vapor bath or to vapor and heat, and one way of accomplishing this is by placing the material into a suitable receptacle into which the hot vapor is passed, although it is not necessary to em ploy a receptacle, as its only object is to keep the room in which the work is being done from being filled with vapor. This treatment sets the copying pencil marks on the linen or paper and also renders them more distinct and legible. The delineation is permanentized and is of the same character as if it had been made of waterproof ink, and can be used for reproduction in the same manner that a tracing made from The pencil that I employ in the practice of my invention is the ordinary copying pencil, readily obtainable at all times on the market.

The practical advantage of my method will be fully appreciated when it is stated that in order to set and keep a line made by a copying pencil from smearing, it is necessary to treat it with moisture; and it is equally necessary to attain this end without any object contacting with the line until the same is completely set. From this it follows that the subjecting of the material bearing the fresh delineation to a vapor bath constitutes the salient feature of my invention.

It will now be apparent that I have devised a new and useful method of making drawings or pictures which embodies the features of advantage enumerated as desirable in the statement of the invention and the above description, and while I have, in the present instance, shown and described a preferred embodiment thereof which will give in practice satisfactory and reliable results, it is to be understood that the same is susceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing.

any of its advantages.

Having thus described my invention, What I claim as new anddesire to secure by Letters Patent, is

The herein described method of making drawings or pictures which consists in delineating the subject matter upon a sheet of material through the medium of a copying pencil, preventing contact of any object 1 With-the-subject 'lnatterso delineated, and then subjecting the material While the delineationisvfresh to-ithe action of vapor.

WALTER R. HOPE. Witnesses:

JOHN STROMFORD, CHAS. W. WA L.

Copies of this patent may be obtained for five cents each; bye'addressing the Commissioner of Patents,

Washington 

